Hey guys!
This thread inspired me to build my own unit for my projector setup. I have somewhat of an interesting setup as I have a sloped wall that both limited my screen's height and required making my screen "float" from the wall. These characteristics mean that the bottom of my screen is only 14.5" from the floor and nearly 20" from the back wall to get my desired 120" screen size. When we originally built this house 2 years ago I had planned to put a screen up in this room (it's a bonus room over our garage) and had installed power in the ceiling, ran conduit to nearly the same location, and pre-wired for surround sound. This also lead to having all of my components underneath the screen.
So after searching for a commercially made unit that could both house all of my components and fit under my screen I realized that the only acceptable solution was going to be to build my own. I finished my screen in the summer of 2010 and unfortunately due to the demands of graduate school, work, and my wife (not to mention enjoying the theater!), my "Man Cave" looked like this for over a year:

(Yes those are text books and direcTV boxes that my componenets are sitting on, can't let them sit on the floor!!!!)
I had originally intended to build a solid one piece box with 3 main compartments, however after evaluating A: How much material (wood) this would be and B: Realizing that I would have to get this upstairs and that a solid piece would be large, heavy, and awkward to handle, I decided to go for the 3 piece approach. 2 virtually identical left and right sides (the left having one less shelf to accommodate my AVR) and a center drawer that my center channel would rest on. I also decided to stain it black to match my speakers.
Here are the boxes after they were initially assembled. My father-in-law and his business partner (guy is a master wood craft hobbyist) helped me assemble these. We used a "Kreg" jig to fasten everything together resulting in minimal filling and virtually no gluing.
Left Hand Box:

Right Hand Box:

Both of these boxes are 42.5" wide, 13.5" tall, and 24" deep and will house all of my components and allow some room for added components if necessary.
Center drawer cabinet:

Center drawer face:

Since we were going to all the trouble of building this (and seeing this already done earlier by goodwad), I decided to add one 120mm case fan to each compartment to help move the air around everything. I ended up using a controlled power strip tied to my receiver so that these are only on when the receiver is on.
One set of fans mounted to one of the backboards (you can see my windows for wires and power cords):

From the backside after being installed on the cabinet:

Up close of the grills to keep the cat from investigating what is making all that air:

And finally everything installed:

Up close of everything:

And the drawer!!!! (That bottom row has 39 blu-rays/PS3 games, that means it should hold around a 120 of these.... Its huge!!!!):

All in all it was a fun project and cost me way less than it would have had I had someone build it for me. Both the left and right cabinets were designed with doors in mind so if I get the urge I can get some glass cut and and add them later. This will probably wait until after we finish the rest of the room ; we want to paint it a dark blue-grey and build a bar for the opposite corner (to hold my popcorn machine off course).